DTC Troubleshooting: 21-1, 21-2

DTC 21-1:  Open in Left Side Seat Belt Buckle Tensioner
DTC 21-2:  Increased Resistance in Left Side Seat Belt Buckle Tensioner

Special Tools Required
SRS inflator simulator (  07SAZ-TB4011A)
 

SRS simulator lead F (  07XAZ-SZ30100)
 


1.Erase the DTC memory.

2.Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay on?


YES - Go to 3.


NO - Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures.


3.Turn the ignition switch OFF. Disconnect the battery negative cable, and wait for 3 minutes.

4.Disconnect the TBLo connector from the TBLi connector (1).

 

5.Connect the special tool (2 W connectors) to the TBLi connector.

6.Reconnect the battery negative cable.

7.Erase the DTC memory.

8.Read the DTC.

Is DTC 21-1 or DTC 21-2 indicated?


YES - Go to 9.


NO - Open or increased resistance in the left side seat belt buckle tensioner; replace the left side seat belt buckle.n


9.Disconnect the battery negative cable, and wait for 3 minutes.

10.Disconnect the SDo and SPo connectors (1) and the TBRo connector (2).

 

11.Disconnect the U2o connector (1) from the SRS unit (A).

 

12.Check resistance between the No. 1 and No. 10 terminals of the U2o connector. There should be 2.0-3.0 W.

 

Is the resistance as specified?


YES - Faulty  SRS unit or poor contact at U2o connector and at the  SRS unit. Check the connection between the connector and the  SRS unit. If the connection is OK, replace the SRS unit.n


NO - Open or increased resistance in the floor wire harness; replace the floor wire harness.n